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<h1>

  Community Round-up #13

</h1>

<p class="meta">
  December 30, 2013
  by
  
    
      <a href="https://twitter.com/vjeux">Vjeux</a>
    
    
  
</p>

<hr>

<div class="post">
  <p>Happy holidays! This blog post is a little-late Christmas present for all the React users. Hopefully it will inspire you to write awesome web apps in 2014!</p>

<h2>React Touch</h2>

<p><a href="http://www.petehunt.net/">Pete Hunt</a> wrote three demos showing that React can be used to run 60fps native-like experiences on mobile web. A frosted glass effect, an image gallery with 3d animations and an infinite scroll view.</p>

<figure><iframe src="//player.vimeo.com/video/79659941" width="100%" height="400" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe></figure>

<p><a href="https://petehunt.github.io/react-touch/">Try out the demos!</a></p>

<h2>Introduction to React</h2>

<p><a href="http://www.phpied.com/">Stoyan Stefanov</a> talked at Joe Dev On Tech about React. He goes over all the features of the library and ends with a concrete example.</p>

<figure><iframe width="100%" height="315" src="//www.youtube-nocookie.com/embed/SMMRJif5QW0" frameborder="0" allowfullscreen></iframe></figure>

<h2>JSX: E4X The Good Parts</h2>

<p>JSX is often compared to the now defunct E4X, <a href="http://blog.vjeux.com/">Vjeux</a> went over all the E4X features and explained how JSX is different and hopefully doesn&#39;t repeat the same mistakes.</p>

<blockquote>
<p>E4X (ECMAScript for XML) is a Javascript syntax extension and a runtime to manipulate XML. It was promoted by Mozilla but failed to become mainstream and is now deprecated. JSX was inspired by E4X. In this article, I&#39;m going to go over all the features of E4X and explain the design decisions behind JSX.</p>

<p><strong>Historical Context</strong></p>

<p>E4X has been created in 2002 by John Schneider. This was the golden age of XML where it was being used for everything: data, configuration files, code, interfaces (DOM) ... E4X was first implemented inside of Rhino, a Javascript implementation from Mozilla written in Java.</p>

<p><a href="http://blog.vjeux.com/2013/javascript/jsx-e4x-the-good-parts.html">Continue reading ...</a></p>
</blockquote>

<h2>React + Socket.io</h2>

<p><a href="http://enome.be/nl">Geert Pasteels</a> made a small experiment with Socket.io. He wrote a very small mixin that synchronizes React state with the server. Just include this mixin to your React component and it is now live!</p>
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="nx">changeHandler</span><span class="o">:</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">data</span><span class="p">)</span> <span class="p">{</span>
  <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="nx">_</span><span class="p">.</span><span class="nx">isEqual</span><span class="p">(</span><span class="nx">data</span><span class="p">.</span><span class="nx">state</span><span class="p">,</span> <span class="k">this</span><span class="p">.</span><span class="nx">state</span><span class="p">)</span> <span class="o">&amp;&amp;</span> <span class="k">this</span><span class="p">.</span><span class="nx">path</span> <span class="o">===</span> <span class="nx">data</span><span class="p">.</span><span class="nx">path</span><span class="p">)</span> <span class="p">{</span>
    <span class="k">this</span><span class="p">.</span><span class="nx">setState</span><span class="p">(</span><span class="nx">data</span><span class="p">.</span><span class="nx">state</span><span class="p">);</span>
  <span class="p">}</span>
<span class="p">},</span>
<span class="nx">componentDidMount</span><span class="o">:</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">root</span><span class="p">)</span> <span class="p">{</span>
  <span class="k">this</span><span class="p">.</span><span class="nx">path</span> <span class="o">=</span> <span class="nx">utils</span><span class="p">.</span><span class="nx">nodePath</span><span class="p">(</span><span class="nx">root</span><span class="p">);</span>
  <span class="nx">socket</span><span class="p">.</span><span class="nx">on</span><span class="p">(</span><span class="s1">&#39;component-change&#39;</span><span class="p">,</span> <span class="k">this</span><span class="p">.</span><span class="nx">changeHandler</span><span class="p">);</span>
<span class="p">},</span>
<span class="nx">componentWillUpdate</span><span class="o">:</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">props</span><span class="p">,</span> <span class="nx">state</span><span class="p">)</span> <span class="p">{</span>
  <span class="nx">socket</span><span class="p">.</span><span class="nx">emit</span><span class="p">(</span><span class="s1">&#39;component-change&#39;</span><span class="p">,</span> <span class="p">{</span> <span class="nx">path</span><span class="o">:</span> <span class="k">this</span><span class="p">.</span><span class="nx">path</span><span class="p">,</span> <span class="nx">state</span><span class="o">:</span> <span class="nx">state</span> <span class="p">});</span>
<span class="p">},</span>
<span class="nx">componentWillUnmount</span><span class="o">:</span> <span class="kd">function</span> <span class="p">()</span> <span class="p">{</span>
  <span class="nx">socket</span><span class="p">.</span><span class="nx">removeListener</span><span class="p">(</span><span class="s1">&#39;component-change&#39;</span><span class="p">,</span> <span class="k">this</span><span class="p">.</span><span class="nx">change</span><span class="p">);</span>
<span class="p">}</span>
</code></pre></div>
<p><a href="https://github.com/Enome/react.io">Check it out on GitHub...</a></p>

<h2>cssobjectify</h2>

<p><a href="http://andreypopp.com/">Andrey Popp</a> implemented a source transform that takes a CSS file and converts it to JSON. This integrates pretty nicely with React.</p>
<div class="highlight"><pre><code class="language-javascript" data-lang="javascript"><span class="cm">/* style.css */</span>
<span class="nx">MyComponent</span> <span class="p">{</span>
  <span class="nx">font</span><span class="o">-</span><span class="nx">size</span><span class="o">:</span> <span class="mi">12</span><span class="nx">px</span><span class="p">;</span>
  <span class="nx">background</span><span class="o">-</span><span class="nx">color</span><span class="o">:</span> <span class="nx">red</span><span class="p">;</span>
<span class="p">}</span>

<span class="cm">/* myapp.js */</span>
<span class="kd">var</span> <span class="nx">React</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">&#39;react-tools/build/modules/React&#39;</span><span class="p">);</span>
<span class="kd">var</span> <span class="nx">Styles</span> <span class="o">=</span> <span class="nx">require</span><span class="p">(</span><span class="s1">&#39;./styles.css&#39;</span><span class="p">);</span>

<span class="kd">var</span> <span class="nx">MyComponent</span> <span class="o">=</span> <span class="nx">React</span><span class="p">.</span><span class="nx">createClass</span><span class="p">({</span>
  <span class="nx">render</span><span class="o">:</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
    <span class="k">return</span> <span class="p">(</span>
      <span class="o">&lt;</span><span class="nx">div</span> <span class="nx">style</span><span class="o">=</span><span class="p">{</span><span class="nx">Styles</span><span class="p">.</span><span class="nx">MyComponent</span><span class="p">}</span><span class="o">&gt;</span>
        <span class="nx">Hello</span><span class="p">,</span> <span class="nx">world</span><span class="o">!</span>
      <span class="o">&lt;</span><span class="err">/div&gt;</span>
    <span class="p">)</span>
  <span class="p">}</span>
<span class="p">});</span>
</code></pre></div>
<p><a href="https://github.com/andreypopp/cssobjectify">Check it out on GitHub...</a></p>

<h2>ngReact</h2>

<p><a href="http://davidandsuzi.com/">David Chang</a> working at <a href="http://www.hasoffers.com/">HasOffer</a> wanted to speed up his Angular app and replaced Angular primitives by React at different layers. When using React naively it is 67% faster, but when combining it with angular&#39;s transclusion it is 450% slower.</p>

<blockquote>
<p>Rendering this takes 803ms for 10 iterations, hovering around 35 and 55ms for each data reload (that&#39;s 67% faster). You&#39;ll notice that the first load takes a little longer than successive loads, and the second load REALLY struggles - here, it&#39;s 433ms, which is more than half of the total time!
<figure><a href="http://davidandsuzi.com/ngreact-react-components-in-angular/"><img src="/react/img/blog/ngreact.png" alt=""></a></figure></p>

<p><a href="http://davidandsuzi.com/ngreact-react-components-in-angular/">Read the full article...</a></p>
</blockquote>

<h2>vim-jsx</h2>

<p><a href="https://github.com/mxw">Max Wang</a> made a vim syntax highlighting and indentation plugin for vim.</p>

<blockquote>
<p>Syntax highlighting and indenting for JSX. JSX is a JavaScript syntax transformer which translates inline XML document fragments into JavaScript objects. It was developed by Facebook alongside React.</p>

<p>This bundle requires pangloss&#39;s <a href="https://github.com/pangloss/vim-javascript">vim-javascript</a> syntax highlighting.</p>

<p>Vim support for inline XML in JS is remarkably similar to the same for PHP.</p>

<p><a href="https://github.com/mxw/vim-jsx">View on GitHub...</a></p>
</blockquote>

<h2>Random Tweet</h2>

<p><center><blockquote class="twitter-tweet" lang="en"><p>I may be starting to get annoying with this, but ReactJS is really exciting. I truly feel the virtual DOM is a game changer.</p>&mdash; Eric Florenzano (@ericflo) <a href="https://twitter.com/ericflo/statuses/413842834974732288">December 20, 2013</a></blockquote></center></p>

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